Learn Spanish (Spain): El chico ese no me cae bien.

Placing the demonstrative adjective after the noun (el chico ese instead of ese chico) adds a dismissive, annoyed, or pejorative tone. It feels similar to saying 'that guy' with an eye-roll in English.

Why use caer bien instead of gustar here?

When talking about people, caer bien and caer mal are the standard ways to express whether you like someone's personality platonically. If you used no me gusta, people might think you are talking about a lack of romantic or physical attraction.

Who is the subject of this sentence?

The subject is el chico ese. The verb caer works just like gustar, meaning the person being judged is the subject doing the action, and the person having the opinion is the indirect object (me). Literally, it translates to something like 'that boy does not fall well to me'.

Could I use no me cae bien if I was talking about a movie I did not like?

No, caer bien and caer mal are primarily used for people. If you use them for food or drinks, it means the item literally disagreed with your stomach and made you feel sick. For a movie or an object, you should stick to no me gusta.